Wagering Studies
 

Curious to know if there have been studies done
on what has the highest success rate betting triactors:
keys, part-wheels or boxes

Treatments on the topic from Steve Crist (Exotic Betting) and Barry Meadow (Money Secrets at the Racetrack) are your best resources. I can ask Maury Wolff as well what he may be aware of or recommend.. Keys are acknowledged as the most effective approach.